- we were treating an int as atomic, which is dubious at best
- it was possible to shutdown while an accept was being handled, and
process that shutdown accept before the real accept finished, leading to
a use-after-free up the stack

It can happen that a timer event causes something to be queued to an
IOCP, which means that on Windows we need to flush that queue each time
a timer event fires during shutdown.

MacOS Build Fix

Untrack Generated node_modules Directory

Fix filter_latency tests

Up timeouts for poll-cv polling strategy

Up retry count to try and counter flakiness

Fix clang-format

Fix mac build

Localize global_wakeup_fd declarations, instead of trying to share them,
so that this bug is less likely to occur in the future.

clang-format port_posix.c

Run Go Advanced Interop

Manual upmerge from v1.0.x

port_posix: use IPv4+IPv6 sockets to check for a free port.

Clang-format code

Fix docker go

UserResource does not reference tcp endpoint on windows

remove concurrent ruby dep from gemspec template

Bypass poll thread if wakeup fd is set

Pretty print outgoing headers

This allows the port picker to function across dual-stack and
IPv4/IPv6-only environments.

For a port to be considered available, the kernel must support at least
one of (IPv6, IPv4), and the port must be available on each supported
family.

Also use the bool type where feasible.

This is based on http://cl/97155408 (for those who can read it.)

Check on *target, not target